Abstract: Herbivory and pollination can affect each other when occurring on the same plant. Leaf damage can modify plant traits that are important for flower visitors, such as the number of flowers, besides its rewards and signals. Little is known about the mechanisms and ecological consequences of leaf damage for plants interacting with a diverse community of flower visitors. In this study, the main goal was to assess if leaf damage can affect the interaction between Trichogoniopsis adenantha (Asteraceae) and its several taxa of floral visitors. In the first chapter, an observational field study was carried out to identify these floral visitors and assess whether they are affected by the intensity of foliar damage by herbivores. Thirty-six morphospecies of floral visitors were recorded, and Lepidoptera was the most frequent taxon. Lepidoptera was not affected by leaf damage. Hymenoptera was the most affected by damage, so that capitula from severe damaged plants received fewer visitors and landings. This effect was attenuated on larger plants with higher reproductive branches and greater number of receptive capitula, and the effect was positive for smaller capitula. We suggest that there is a trade-off between capitulum size and attractiveness in plants with more leaf damage. In the second chapter, we explored a mechanistic pathway for the effect of leaf damage on floral visitors. We tested whether different levels of mechanical leaf damage to the branches modified the profile of volatile compounds and the interaction of floral visitors with the capitula minutes after damage and 24h later. In the field, moderate damage (25-50% of leaf area removed) decreased the number of visitors and landings shortly after damage and 24h later. The approaches to the capitula increased 24h after damage in the branches with 25% of damage compared to control and other levels of damage. We detected 48 volatile terpenes, one benzenoid, and one aliphatic compound in the branches. We did not detect specific floral compounds. Removal of 50% of the leaf area did not change the total amount of volatiles emitted, but the emission of some compounds decreased right after damage and increased 24h later. We argued that there is a cause-effect relationship between these changes in volatile profile and the effects of damage on floral visitors. These results improve the knowledge about how foliar herbivory can affect the interaction between plants and floral visitors, as well as about mechanisms of indirect ecological effects in communities